Late January through March, roughly 400,000 wildebeest calves are born within a tight three-to-four-week peak on the short-grass plains around Ndutu and the southern Serengeti — one of the highest concentrations of newborn mammals anywhere on Earth, and the predator action that follows is relentless: cheetah, lion and hyena all key in on the easiest hunting season of their year. It draws a fraction of the crowds that the July-through-September crossings do, largely because it lacks the single dramatic 'moment' of a river crossing that markets so well in brochures, but the wildlife density and predator interactions genuinely rival or exceed peak season. The plains here are flat, open and short-grassed specifically because that is what triggers calving — easy predator visibility for the herds, and easy game-viewing sightlines for you. Weather is warm and mostly dry with only occasional short showers, night skies are exceptional, and camps run noticeably below their July-September rates for what many repeat safari-goers consider the single best wildlife month in the entire Serengeti calendar. If you have already 'done' a crossing-season trip, this is where we send you next.